JPH0966597A - Printer with bearing normal positioning mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to effectively support an eccentric bearing by holding the bearing of a rubber cylinder at a normal position in the case of mounting a cylindrical blanket on the cylinder. SOLUTION: An opening 7 is provided at the frame 8 of an eccentric bearing side provided at the shaft of a rubber cylinder 1. The opening 7 is so provided as to make it possible to open or close by slide bases 16, 17 moving along the surface of the frame 8. When the bases 16, 17 are closed, an eccentric bearing 18 is supported by the bases 16, 17. On the other hand, bearings 65, 66 for holding the eccentric bearing at the normal position by advancing it with respect to the eccentric bearing to lift the eccentric bearing in the case of closing the bases 16, 17 are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing apparatus having a positioning mechanism for a bearing portion of a cylinder on which printing materials such as a cylindrical blanket and a printing plate are mounted.

[0002]

2. Description of the Related Art A blanket for receiving ink from a plate cylinder and transferring it to paper is mounted on a blanket cylinder of an offset printing machine. This blanket is generally a flat plate wrapped around a blanket cylinder, but the blanket cylinder must be provided with a gap for holding a gripping mechanism for gripping both ends of the blanket. Was supposed to make.

For this reason, instead of the above-mentioned gap type cylinder, a blanket having a cylindrical shape and fitted into a cylinder having no gap is considered and put into practical use. FIG. 9 shows an outline of an example of a printing machine using such a tubular blanket. In this figure,
Reference numerals 1 and 2 denote upper and lower blanket cylinders (cylinders), and a cylindrical blanket 3 is mounted on the outer side thereof. Reference numerals 4 and 5 denote plate cylinders (cylinders) that are in contact with the blanket cylinder, and the plates are mounted on the peripheral surface thereof. Reference numeral 6 denotes paper that is rewound from a paper roll supported by a paper feeding device (not shown) and passed between the upper and lower blanket cylinders 1 and 2.

Attachment and removal of the tubular blanket 3 to and from the blanket cylinders 1 and 2 must be performed from the axial ends of the blanket cylinders 1 and 2, and therefore, in a printing machine employing the tubular blanket, The support on one end side in the axial direction of the blanket cylinder can be released, and a part of the frame 8 can be opened and closed.

Japanese Unexamined Patent Publication No. 6-191007 discloses a mechanism for releasing a bearing portion of a blanket cylinder of a printing machine which employs a cylindrical blanket and for opening a part of a frame. The mechanism is provided with an opening (for example, indicated by reference numeral “7” in FIG. 9) provided in the frame, and in this opening,
A door that swings and opens vertically to the surface of the frame of the printing machine is provided, and a fastener that holds the bearing portion of the blanket cylinder is provided on this door.
This fastener is releasable from the bearing portion.

[0006]

However, in the one disclosed in the above publication, since the fastener for supporting the bearing portion is supported on the frame side through the link mechanism, that is, the force is transmitted by the pin. Because it is done through
The fixing force of the cylinder at the time of printing was weak, and there was a possibility that high quality printed matter could not be obtained.

Further, by releasing the support of the bearing portion,
If the blister cylinder is cantilevered and the open end lowers.If the eccentric bearing is used as a bearing for the bearing part of the blanket cylinder to attach / detach to / from other plate cylinders, etc., the eccentric bearing rotates due to its own weight. However, it becomes impossible to maintain the state when the bearing portion support is released. In this way, when the eccentric bearing portion itself has rotated, it becomes necessary to readjust the position when holding the bearing portion after mounting the blanket. still,
If the plate cylinder is gapless,
That is, the same occurs when the plate mounted on the plate cylinder is cylindrical and a similar mechanism is adopted.

[0008]

According to a first aspect of the present invention, which solves the above-mentioned problems, a cylinder on which a cylindrical printing material is mounted and shafts at both ends of the cylinder are supported by a frame of a printing machine. In a printing device provided with an eccentric bearing, an opening provided in a frame on one shaft side of the cylinder and the opening and closing by moving the opening along a surface of the frame, and at the time of closing, the A pair of slide bases for holding the eccentric bearings and a holding member for holding the eccentric bearings in a regular position prior to closing the slide bases are provided.

[0009] The second invention of the present application for solving the above problems is as follows.
In a printing device including a cylinder on which a cylindrical printing material is mounted and an eccentric bearing that supports shaft portions at both ends of the cylinder with respect to a frame of a printing machine, the printing device is provided on a frame on one shaft portion side of the cylinder. An opening, a pair of slide bases that open and close by moving the opening along a surface of the frame, and hold the eccentric bearing when the frame is closed; a gear provided on the eccentric bearing; A segment gear supported on the slide base and capable of meshing with the gear; a drive mechanism for driving the segment gear; and a holding member for holding the eccentric bearing at a regular position prior to closing the slide base. Characterize.

According to the printing apparatus of the first invention, the slide base moves along the surface of the frame to open the opening of the frame, and the cylindrical printing material can be exchanged from there. When the eccentric bearing is held, the eccentric bearing is held so as to be sandwiched by the pair of slide bases that move in the surface direction of the frame, so that the eccentric bearing is firmly held when the printing apparatus is operating. Also, prior to closing the slide base and holding the eccentric bearing,
The holding member moves, and the eccentric bearing is held in the normal position.

According to the printing apparatus of the second aspect of the present invention, as means for attaching and detaching the cylinder to another cylinder,
If the eccentric bearing has a gear and the slide base has a segment gear that meshes with it, the holding member moves before the slide base is closed and the eccentric bearing is held. If the gears are held at the position, the gears can be meshed with each other without any deviation.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a printing apparatus according to an embodiment of the present invention (a view as seen from the side of the printing machine), and FIG. 2 is a view with its slide base omitted.
3 and 4 are views including the slide base taken along arrows III-III and IV-IV in FIG. 2, FIG. 5 is a sectional view taken along the drive mechanism, and FIG. 6 is a detailed view of the eccentric bearing support portion of FIG. 7 is a view seen from the upper side of the slide base, and FIG. 8 is a front view of the eccentric bearing holding mechanism.

The structure relating to the printing function of the printing machine itself is the same as that shown in FIG. That is, the printing machine of interest here is the plate cylinders 4 and 5 and the blanket cylinders 1 and 2 in the vertical direction.
It is an offset rotary printing machine equipped with. An opening 7 through which a cylindrical blanket 3 mounted on the blanket cylinders 1 and 2 can pass is formed in a frame 8 on one side (operation side) of the printing machine. The opening 7 is formed on the blanket cylinders 1 and 2 in a slightly inclined manner in accordance with the arrangement. Fixed bases 11 and 12 are fixed on the outer surface of the frame 8 on both sides of the opening 7.

Two rails 13 are provided on the fixed bases 11 and 12, respectively, so as to extend in a direction substantially orthogonal to the vertical direction of the opening 7. These rails 1
Slide bases 16 and 17 having linear bearings 15 fitted to these rails 13 are mounted on the base plate 3. On the facing surfaces of the slide bases 16 and 17,
Semi-arcuate gripping surfaces 21a, 21b for closely contacting and gripping the eccentric bearing 18 mounted on the end of the shaft of the blanket cylinder 1 and the bearing 20 mounted on the end of the shaft of the blanket cylinder 2,
22a and 22b are formed.

At the rear end of the slide base 16 (on the left side in FIG. 1) (the surface opposite to the grip surface 21),
The pin shaft 24 is supported via the fixed link member 23. One end of a link 25 is connected to the pin shaft 24. On the other hand, a lever shaft 26 is attached to the frame 8, and the other end of the link 25 is connected to one end of a lever 27 rotatably supported by the lever shaft 26 via a pin 28. An end of a slide base opening / closing air cylinder 30 is supported by a pin shaft 29 on the frame 8 diagonally below the slide base 16.
The tip of a rod 31 of the air cylinder 30 is connected to the other end of the lever 27 by a pin 32.

Therefore, when the rod base 31 is expanded and contracted by the operation of the slide base opening / closing air cylinder 30, the lever 27 is rotated, and the slide base 16 reciprocates on the rail 13 via the link 25, that is, the opening / closing motion. To do. More specifically, when the rod 31 extends, the lever 27 rotates clockwise to push the link 25, the slide base 16 moves in the closing direction, and when the rod 31 contracts, the lever 27 rotates counterclockwise. The slide base 16 moves, the link 25 is pulled back, and the slide base 16 moves in the opening direction. A stopper 33 for restricting the clockwise rotation of the lever 27 is attached to the outer surface of the frame 8 to restrict the closed position of the slide base 16. In FIG. 1, the closed state of the slide base 16 is shown by a solid line, and the opened state is shown by a chain double-dashed line. In order to fix the slide base 16 in the closed position, the positioning pin fitting hole 34 is provided on the fixed base 11.
The positioning block 35 having the above is attached, and the slide base 16 is provided with a positioning pin air cylinder 37 having a pin 36 that can be fitted into the positioning pin fitting hole 34.

Cylinder support bases 38 are installed on the outer surface of the frame 8 on both the upper and lower sides of the slide base 16, and the ends of the slide base opening / closing air cylinders 39 are connected to the cylinder support bases 38 by pins 40. There is. The tip of the rod 41 of each slide base opening / closing air cylinder 39 is connected to the upper and lower surfaces of the slide base 17 via a pin shaft 42. That is, the slide base 17 is opened and closed by the operation of the slide base opening / closing air cylinder 39. Since the rod 41 of the air cylinder 39 for opening and closing the slide base is contracted to fix the slide base 17 at the closed position, the positioning pin fitting holes 43 are provided on the upper and lower sides of the frame 8 at the closed position of the slide base 17.
A positioning block 44 having a positioning pin fitting hole 4 is attached to both upper and lower surfaces of the slide base 17.
There is provided a positioning pin air cylinder 46 having a positioning pin 45 that can be fitted in 3.

When these upper and lower slide bases 16 and 17 are in the closed position, their arcuate gripping surfaces 21a and 21 are formed.
The eccentric bearings 18 and 20 of the upper and lower blanket cylinders 1 and 2 are supported by b, 22a and 22b.

A gear or segment gear 47 is integrally provided on the outer periphery of the eccentric bearing 18 provided at the end of the shaft portion of the upper blanket cylinder 1. On the other hand, on the slide base 16, a segment gear 48 on the slide base side that meshes with the segment gear 47 when the slide base 16 is in the closed position is rotatably provided by a pin 49. That is, the segment gear 48 and the segment gear 47
When the eccentric bearing 18 is rotated by the engagement with the center of the blanket cylinder 1, the blanket cylinder 1 is disengaged from the plate cylinder 4 and the lower blanket cylinder 2.

A lever 50 is integrated with the segment gear 48.
Is attached to the end of the lever 50
The one end of the rod 52 is connected by. Rod 52
The other end is connected to one end of a lever 53 pivotally attached to the lever shaft 26 via a pin 54. On the frame 8 diagonally above the slide base 16, the end of the air cylinder 55 for removing the blanket cylinder is attached to the pin shaft 56.
The tip of a rod 57 of the air cylinder 55 is connected to the other end of the lever 53 by a pin 58. Therefore, the air cylinder 55 for removing the blanket cylinder
Operation causes the segment gear 48 to move to the segment gear 47.
By rotating the eccentric bearing 18 by meshing with, the blanket cylinder 1 is attached to and detached from the plate cylinder 4 and the blanket cylinder 2. The frame 8 is provided with a stopper 59 that restrains the movement of the lever 50 and determines the mounting position of the blanket cylinder 1.

By opening the slide bases 16 and 17, the support of the blanket cylinder 1 is released and the segment gears 47 and 48 are disengaged, so that the blanket cylinder 1 is cantilevered by the frame on the other side. Eccentric bearing 1
8 rotates due to its own weight. Therefore, after replacing the cylindrical blanket 3, the slide base 16,
When 17 is closed, the bearings 18 and 20 are pushed up by the slide bases 16 and 17, and the load is applied to the slide bases 16 and 17, and the segment gears 47 and
The meshing of 48 may be out of alignment, and fine adjustment may be necessary.

Therefore, the printing apparatus according to the present invention is provided with a regular positioning mechanism for returning the eccentric bearing 18 to its original position prior to closing the slide bases 16 and 17. FIG. 2 shows the details of the regular positioning mechanism 61. An air cylinder 62 for normal positioning is provided at the center of the fixed base 12 provided on the right side (in FIG. 2) of the opening 7 of the frame 8. The L-shaped member 6 is attached to the tip of the rod 63 of the air cylinder 62.
4 is attached, and rolling bearings 65 and 66 are provided as holding members at each end of the L-shaped member 64. When the normal positioning air cylinder 62 operates and the rod 63 extends a predetermined amount, each bearing 65,
66 comes to the position where it comes into contact with the outer peripheral surface of the eccentric bearing 18 of the blanket cylinder 1 in the regular position.

Next, the replacement work of the cylindrical blanket 3 in the printing apparatus according to the present invention will be described. When the blanket 3 needs to be replaced, first, the blanket cylinder attaching / detaching air cylinder 55 operates to extend the rod 57, and the segment gear 48 rotates via the lever 53, the rod 57, and the lever 50. The eccentric bearing 18 is rotated by the engagement of the 48 and the segment gear 47, and the blanket cylinder 1 is disengaged from the plate cylinder 4 and the blanket cylinder 2.

Next, the positioning pin air cylinder 37 is operated and the positioning pin 36 is pulled out from the positioning pin fitting hole 34 of the positioning block 35, while the positioning pin air cylinder 46 is operated and the positioning pin 45 is positioned. The slide bases 16 and 17 are pulled out from the positioning pin fitting holes 43 of the block 44, and the fixed base 1
The restraint with 1 and 12 is released.

Next, the slide base opening / closing air cylinder 30 is actuated and the rod 31 is contracted.
7 rotates counterclockwise, the slide base 16 is pulled and opened leftward in FIG. 1 via the link 25, and the slide base opening / closing cylinder 39 is operated to extend the rod 41, whereby the slide base 17 is extended. Is pushed to the right and opens. When the slide bases 16 and 17 are opened, the mesh between the segment gear 47 and the segment gear 48 is released, and the support of the eccentric bearing 18 is released.

In this state, the blanket 3 of the blanket cylinder 1 is exchanged through the opened opening 7.

After the replacement of the blanket 3, the regular positioning cylinder 62 in the regular positioning mechanism 61.
The rod 63 extends, the bearings 65 and 66 of the L-shaped member 64 move from the position shown by the solid line in FIG. 2 to the position shown by the chain line, and contact the outer peripheral surface of the eccentric bearing 18 to move the eccentric bearing 18 Push it up to the proper position. When the eccentric bearing 18 is pushed up to the normal position, that is, returned to the original position, the segment gear 48 around the eccentric bearing 18 also returns to the original state.

Next, the slide base opening / closing air cylinder 30 and the slide base opening / closing air cylinder 39 are operated to close the slide bases 16 and 17, and the upper and lower blanket cylinders 1 are held by the gripping surfaces 21a, 21b, 22a and 22b. The outer peripheral surfaces of the two eccentric bearings 18 and 20 are supported. At this time, since the eccentric bearing 18 is in the normal position,
The segment gear 48 on the slide base 16 side meshes with the segment gear 47 in the same state as before separation. Therefore, when the segment cylinder 48 rotates a predetermined amount by the operation of the air cylinder 55 for attaching / detaching the blanket cylinder, the eccentric bearing 18 rotates together with the segment gear 47 meshing with the segment gear 48, and the blanket cylinder 1 moves a minute amount to cause the plate cylinder 4 to move. And blanket 2
It will come in contact with an appropriate nip pressure.

In the above embodiment, the regular positioning mechanism 6
Two rolling bearings 6 as holding members
5 and 66 are used, the holding member may be any member that supports the outer peripheral surface of the eccentric bearing 18, and may not rotate, and the number of holding members is limited to two. Not a thing.

In the above embodiment, the slide base 16
The rotation of the segment gear 48 provided on the side is performed by an air cylinder via a link mechanism. However, a drive mechanism such as an air cylinder is provided on the slide base 16 so that the segment gear 48 can be moved directly or by a lever. You may make it drive via.

Further, in the above-mentioned embodiment, the blanket is mentioned as the cylindrical printing material, but it may be a plate of the plate cylinder. The above embodiment is a printing machine (BB type offset printing machine) having a cylinder arrangement of plate cylinder-blanket cylinder-blanket cylinder-plate cylinder.
Although the present invention is applied to, the present invention is not limited to such printing on both sides of the web, for example,
Sheet (sheet) in a cylinder arrangement of plate cylinder-blanket cylinder-impression cylinder
It is also applicable to a blanket cylinder or a plate cylinder of a printing machine that prints one side of.

[0032]

According to the printing apparatus of the present invention, before the slide base is closed and the bearing portion of the cylinder is supported, the bearing portion of the cylinder is supported at the regular position by the regular positioning mechanism. Therefore, the cylinder is surely supported when the slide base is closed, and the bearing is strongly supported. Further, since the slide base directly grips the bearing portion, the support is strong also on this surface.

Further, when the present invention is applied to the one using the gear on the bearing side, the gear on the slide base side, and the link mechanism as the mechanism for rotating the eccentric bearing, when the slide base is opened, the gears are engaged with each other. Even if the position of the cylinder bearing in the direction of rotation shifts due to the meshing of the gears, it will be corrected by performing the normal positioning, so when the slide base is closed, the gears will mesh in their original state. It is possible to prevent the wearing state of the person from changing.

[Brief description of drawings]

FIG. 1 is a front view of a printing apparatus according to an embodiment of the present invention (a side view of a printing machine).

FIG. 2 is a front view of the printing apparatus according to the embodiment of the present invention with the slide base omitted.

3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a sectional view taken along the drive mechanism of the printing apparatus according to the embodiment of the present invention.

FIG. 6 is a detailed view of the eccentric bearing support portion in FIG.

FIG. 7 is a diagram viewed from the upper side of the slide base of the printing apparatus according to the embodiment of the invention.

FIG. 8 is a front view of a regular positioning mechanism of the printing apparatus according to the embodiment of the invention.

FIG. 9 is a schematic view of an offset rotary printing press that is the subject of the present invention.

[Explanation of symbols]

 1, 2 Blanket cylinder 3 Blanket 4, 5 Plate cylinder 6 Paper roll 7 Opening 8 Frame 11, 12 Fixed base 13 Rail 15 Linear bearing 16, 17 Slide base 18 Eccentric bearing 20 Bearing 26 Lever shaft 30 Slide base opening / closing air cylinder 33 Stopper 34 Positioning pin fitting hole 37 Positioning pin air cylinder 39 Slide base opening / closing air cylinder 43 Positioning pin fitting hole 46 Positioning pin air cylinder 47 Segment gear 48 Segment gear 50 Lever 55 Rubber cylinder removable air cylinder 61 Regular position Feeding mechanism 62 Air cylinder for regular positioning 64 L-shaped member 65, 66 Rolling bearing

Claims (2)

[Claims] 1. A printing machine comprising a cylinder on which a cylindrical printing material is mounted and eccentric bearings for supporting shaft portions at both ends of the cylinder with respect to a frame of the printing machine. An opening provided in the frame, a pair of slide bases that open and close by moving the opening along the surface of the frame, and hold the eccentric bearing when the slide base is closed; A printing device, comprising: a holding member that holds the eccentric bearing in a regular position. 2. A printing machine comprising a cylinder on which a cylindrical printing material is mounted, and eccentric bearings for supporting shaft portions at both ends of the cylinder with respect to a frame of the printing machine, wherein one shaft portion side of the cylinder An opening provided in the frame, a pair of slide bases that open and close by moving the opening along the surface of the frame, and hold the eccentric bearing when the frame is closed, and an integral part of the eccentric bearing. A gear provided on the slide base, a gear on the slide base side supported on the slide base and capable of meshing with the gear, a drive mechanism for driving the gear on the slide base side, and a regular eccentric bearing before closing the slide base. And a holding member for holding it at the position.